| 摘要 |
PURPOSE:To lower the coefft. of friction with a sliding member and to obtain the excellent traveling stability and wear resistance and high durability of the magnetic recording medium having a ferromagnetic metallic thin film by providing a protective layer contg. a specific fluorine compd. as a lubricant. CONSTITUTION:The protective layer contg. the fluorine compd. expressed by formula I is formed on the ferromagnetic metallic thin film layer. In the formula I, R1 and R2 denote a perfluoropolyether group; X denotes -COCO-, -SS-, polyvalent aliphat. group, arom. group, heterocyclic group, and a group which is substd. therewith and is selected from the groups having the org. groups connecting with R1 and R2; m and n are 1 to 2. Such protective layer can be formed by applying or spraying a soln. obtd. by dissolving the fluorine compd. in a solvent on the surface of the ferromagnetic metallic thin film layer and drying the coating or conversely, by immersing the ferromagnetic metallic thin film layer into the soln. and drying the layer. The magnetic recording medium which is improved in the wear resistance and can exhibit the high durability is obtd. in this way. |
